First off, I have only had good experiences with Vevor brand products. They produce a really wide variety of products and seem to do a great job at all of them. Compared to other portable fans I've owned, this one blows the competition away (pun intended). While it doesn't as much air as you'd expect from a corded fan of this style, it does move enough to be useful. The adjustment knob allows you to set a good range of fan speeds. What impressed me most about this fan was how long it lasted on full power mode during the first use. I had it running for a couple hours and the power indicator still showed the 100% lit up. I would imagine that on a lower speed setting, this fan would easily run for nearly an entire day. Super happy with this fan!